INTRODUCTION AND DEFINITION OF LAMINAR FLAWS PROVIDED BY FLAW EVALUATION CODE

1 HASEGAWA Kunio
Co-authors:
1 STRNADEL Bohumir 2 LACROIX Valery
Institutions:
1 Center of Advanced Innovation Technologies, VSB-Technical University of Ostrava, Czech Republic, EU
2 Tractebel Engineering, Brussels, Belgium, EU
Conference:
24th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, June 3rd - 5th 2015
Proceedings:
Proceedings 24th International Conference on Metallurgy and Materials
Pages:
535-539
ISBN:
978-80-87294-58-1
ISSN:
2694-9296
Published:
12th January 2015
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
71 views / 12 downloads
Abstract

Delamination or laminar flaws were sometimes detected during manufacturing and/or plant operations. A laminar flaw is a subsurface flaw parallel to the rolling direction of the plate. Definition of the laminar flaw is provided only in the ASME Boiler & Pressure Vessel Code Section XI and API 579/ASME FFS-1 Code. In addition, the both Codes provide different combination rules for multiple laminar flaws.Besides, a large number of laminar indications were detected in pressure vessels. The observed indications were caused by hydrogen flaking induced during the manufacturing process. The ASME Code Section XI Committees have recently developed a rule that provides a combination methodology for a large number of quasi-laminar flaws.This paper introduces the definitions and combination rules of laminar flaws defined by the ASME and API 579/ASME FFS-1 Codes, and quasi-laminar flaws newly developed by the ASME Code Case.

Keywords: laminar flaw, quasi-laminar flaw, subsurface flaw, combination rule, code

© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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